Swamp Sunflower Seeds – 200 Helianthus Angustifolius Native Perennial Seeds

Swamp Sunflower (Helianthus angustifolius) is a native perennial known for its late-season burst of bright yellow, daisy-like blooms. This tall, clump-forming wildflower brings bold color to wet meadows, rain gardens, and pollinator plantings when many other flowers have finished for the year. Its narrow, grass-like foliage adds fine texture to the garden, and the cheerful flowers are highly attractive to bees and butterflies.

Ideal for naturalized areas, borders, and low-lying spots that stay consistently moist, Swamp Sunflower is a rugged, low-maintenance choice for gardeners who want reliable late-season interest. It pairs well with other native perennials and ornamental grasses, and its seeds are easy to sow for those looking to establish a lasting wildflower patch.

Plant Features

• Native perennial wildflower with bright yellow, daisy-like blooms
• Provides late-season nectar for bees and butterflies
• Tolerates wet, boggy soils and occasional flooding
• Tall, clump-forming habit with narrow, grass-like leaves
• Excellent for rain gardens, meadows, and naturalized plantings

Growing Information

• Botanical Name: Helianthus angustifolius
• Plant Type: Herbaceous perennial
• Sunlight: Full sun to partial shade
• Soil: Moist to wet, well-drained to boggy soils
• Water Requirements: Medium to high; prefers consistent moisture
• Growth Habit: Upright, clump-forming
• Bloom Season: Late summer to fall
• Mature Height: 3 to 6 feet
• Spacing: 18 to 24 inches apart

Planting & Care

Sow Swamp Sunflower seeds indoors 6 to 8 weeks before the last frost, or direct sow outdoors after the danger of frost has passed. Press seeds lightly into the soil surface and keep them consistently moist; light is needed for germination. Maintain even moisture until seedlings emerge, then grow them on in bright light. Transplant outdoors once plants are sturdy and all frost risk has passed.

Choose a site with full sun to partial shade and soil that stays moist, such as a rain garden, pond edge, or low spot in the landscape. Water regularly during the first growing season to help plants establish. Once established, Swamp Sunflower is fairly low-maintenance; divide clumps every few years to maintain vigor and prevent overcrowding. Cut back stems in late winter or early spring before new growth begins.

What's Included

200 Swamp Sunflower (Helianthus angustifolius) seeds.